/*
 * Copyright (c) 2008-2009 Telecom Bretagne
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation;
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Author: Mehdi Benamor <benamor.mehdi@ensi.rnu.tn>
 */

#include "ipv6-autoconfigured-prefix.h"

#include "ipv6-l3-protocol.h"

#include "ns3/log.h"
#include "ns3/node.h"

namespace ns3
{

NS_LOG_COMPONENT_DEFINE("Ipv6AutoconfiguredPrefix");

uint32_t Ipv6AutoconfiguredPrefix::m_prefixId = 0;

Ipv6AutoconfiguredPrefix::Ipv6AutoconfiguredPrefix(Ptr<Node> node,
                                                   uint32_t interface,
                                                   Ipv6Address prefix,
                                                   Ipv6Prefix mask,
                                                   uint32_t preferredLifeTime,
                                                   uint32_t validLifeTime,
                                                   Ipv6Address router)
{
    if (preferredLifeTime + validLifeTime == 0)
    {
        NS_LOG_WARN("Ipv6AutoconfiguredPrefix: Preferred and Valid Lifetimes are zero, the address "
                    "will be removed immediately.");
    }
    m_node = node;
    m_interface = interface;
    m_validLifeTime = validLifeTime;
    m_preferredLifeTime = preferredLifeTime;
    m_id = m_prefixId;
    m_prefixId++;
    m_preferred = false;
    m_valid = false;
    m_prefix = prefix;
    m_mask = mask;
    m_defaultGatewayRouter = router;
}

Ipv6AutoconfiguredPrefix::~Ipv6AutoconfiguredPrefix()
{
}

void
Ipv6AutoconfiguredPrefix::SetDefaultGatewayRouter(Ipv6Address router)
{
    m_defaultGatewayRouter = router;
}

Ipv6Address
Ipv6AutoconfiguredPrefix::GetDefaultGatewayRouter() const
{
    return m_defaultGatewayRouter;
}

void
Ipv6AutoconfiguredPrefix::SetInterface(uint32_t interface)
{
    m_interface = interface;
}

uint32_t
Ipv6AutoconfiguredPrefix::GetInterface() const
{
    return m_interface;
}

void
Ipv6AutoconfiguredPrefix::SetPreferredLifeTime(uint32_t t)
{
    m_preferredLifeTime = t;
    if (m_preferredLifeTime + m_validLifeTime == 0)
    {
        NS_LOG_WARN("Ipv6AutoconfiguredPrefix: Preferred and Valid Lifetimes are zero, the address "
                    "will be removed immediately.");
    }
}

uint32_t
Ipv6AutoconfiguredPrefix::GetPreferredLifeTime() const
{
    return m_preferredLifeTime;
}

void
Ipv6AutoconfiguredPrefix::SetValidLifeTime(uint32_t t)
{
    m_validLifeTime = t;
    if (m_preferredLifeTime + m_validLifeTime == 0)
    {
        NS_LOG_WARN("Ipv6AutoconfiguredPrefix: Preferred and Valid Lifetimes are zero, the address "
                    "will be removed immediately.");
    }
}

uint32_t
Ipv6AutoconfiguredPrefix::GetValidLifeTime() const
{
    return m_validLifeTime;
}

void
Ipv6AutoconfiguredPrefix::MarkPreferredTime()
{
    m_preferred = true;
}

void
Ipv6AutoconfiguredPrefix::MarkValidTime()
{
    m_preferred = false;
    m_valid = true;
}

void
Ipv6AutoconfiguredPrefix::FunctionPreferredTimeout()
{
    NS_LOG_INFO("Preferred Time expired for " << m_prefix);
    m_preferred = false;
    MarkValidTime();
    StartValidTimer();
}

void
Ipv6AutoconfiguredPrefix::FunctionValidTimeout()
{
    NS_LOG_INFO("Valid Time expired for " << m_prefix);
    m_valid = false;
    RemoveMe();
}

void
Ipv6AutoconfiguredPrefix::StartPreferredTimer()
{
    if (m_preferredLifeTime != 0xffffffff)
    {
        NS_LOG_INFO("Start PreferredTimer for " << m_prefix);
        m_preferredTimer.SetFunction(&Ipv6AutoconfiguredPrefix::FunctionPreferredTimeout, this);
        m_preferredTimer.SetDelay(Seconds(m_preferredLifeTime));
        m_preferredTimer.Schedule();
    }
}

void
Ipv6AutoconfiguredPrefix::StartValidTimer()
{
    if (m_validLifeTime != 0xffffffff)
    {
        NS_LOG_INFO("Start ValidTimer for " << m_prefix);
        m_validTimer.SetFunction(&Ipv6AutoconfiguredPrefix::FunctionValidTimeout, this);
        m_validTimer.SetDelay(Seconds(m_validLifeTime - m_preferredLifeTime));
        m_validTimer.Schedule();
    }
}

void
Ipv6AutoconfiguredPrefix::StopPreferredTimer()
{
    if (m_preferredTimer.IsRunning())
    {
        NS_LOG_INFO("Stop PreferredTimer for " << m_prefix);
        m_preferredTimer.Cancel();
    }
}

void
Ipv6AutoconfiguredPrefix::StopValidTimer()
{
    if (m_validTimer.IsRunning())
    {
        NS_LOG_INFO("Stop ValidTimer for " << m_prefix);
        m_validTimer.Cancel();
    }
}

void
Ipv6AutoconfiguredPrefix::RemoveMe()
{
    NS_LOG_INFO("The prefix " << m_prefix << " will be removed on interface " << m_interface);
    Ptr<Ipv6L3Protocol> ipv6 = m_node->GetObject<Ipv6L3Protocol>();
    ipv6->RemoveAutoconfiguredAddress(m_interface, m_prefix, m_mask, m_defaultGatewayRouter);
}

void
Ipv6AutoconfiguredPrefix::SetPreferred()
{
    m_preferred = true;
}

void
Ipv6AutoconfiguredPrefix::SetValid()
{
    m_preferred = false;
    m_valid = true;
}

uint32_t
Ipv6AutoconfiguredPrefix::GetId() const
{
    return m_id;
}

bool
Ipv6AutoconfiguredPrefix::IsPreferred() const
{
    return m_preferred;
}

bool
Ipv6AutoconfiguredPrefix::IsValid() const
{
    return m_valid;
}

Ipv6Address
Ipv6AutoconfiguredPrefix::GetPrefix() const
{
    return m_prefix;
}

void
Ipv6AutoconfiguredPrefix::SetPrefix(Ipv6Address prefix)
{
    m_prefix = prefix;
}

Ipv6Prefix
Ipv6AutoconfiguredPrefix::GetMask() const
{
    return m_mask;
}

void
Ipv6AutoconfiguredPrefix::SetMask(Ipv6Prefix mask)
{
    m_mask = mask;
}

} /* namespace ns3 */
